Abstract
The fish specimens sent to Vienna by the Austrian naturalist Emanuel Ritter von Friedrichsthal (1809 – 1842) constitute one of the oldest collections of freshwater fishes from Central America. The holotype of Heros friedrichsthalii and specimens of Atherinella sardina were collected in the Rio San Juan or Lago de Nicaragua drainage in Nicaragua. The types of Cichlasoma urophthalmus stenozonum, Heros melanopogon and Heros triagramma, as well as specimens of Petenia splendida and Eugerres plumieri were most probably collected at Bacalar, Quintana Roo. Cichlasoma loisellei (Bussing, 1989), is synonymized with Parachromis friedrichsthalii (Heckel, 1840). The species hitherto referred to as P. friedrichsthalii takes the valid name Parachromis multifasciatus (Regan, 1905). A lectotype is designated for Cichlasoma urophthalmus stenozonum (Hubbs, 1936), which is synonymized with Mayaheros urophthalmus (Günther, 1862).
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